Motorbike, someone pointed this out on BITOG
It's the only oil EM states that it cleans/deposits and sludge.
quote:Our lineup of Mobil 1 motor oils includes a 0W-40 viscosity, which is the viscosity recommended by many European car builders. Mobil 1 0W-40's wide viscosity range provides unsurpassed levels of protection and an overall smooth driving experience. Mobil 1 0W-40 keeps engines starting in Arctic-extreme cold, and it cleans deposits, sludge and varnish often formed in high temperature operating conditions.